<!doctype html>
<html ng-app>
	<head>
		<script src="http://code.angularjs.org/angular-1.0.1.min.js"></script>
	</head>
	<body>
		Your name:
		<input type="text" ng-model="yourname" placeholder="World">
		<hr>
		Hello {{yourname || 'World'}}!
		<br/>
		<p>
			1 + 2 = {{ 1 + 2 }}
		</p>
		<br/>
	</body>
</html>